What happens to the muscle on the opposite side of the arm?

The glenohumeral joint—commonly referred to as the shoulder joint—consists of the attachment of the humerus bone to the scapula. Many actions occur at this ball-and-socket joint.

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

amber has allowed scientists to study dna that has been preserved over millions of years.